the Week of Proper 20 / Ordinary 25
Easton's Bible Dictionary
In Esther 8:9; 9:3 (RSV, "governor") it denotes a Persian prefect "on this side" i.e., in the region west of the Euphrates. It is the modern word Pasha .
In Acts 13:7,8,12; 18:12 , it denotes a proconsul; i.e., the governor of a Roman province holding his appointment from the senate. The Roman provinces were of two kinds, (1) senatorial and (2) imperial. The appointment of a governor to the former was in the hands of the senate, and he bore the title of proconsul (Gr. anthupatos). The appointment of a governor to the latter was in the hands of the emperor, and he bore the title of propraetor (Gr. antistrategos).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Deputy'. Easton's Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​ebd/​d/deputy.html. 1897.